Copying lathe



C. E. REED, JR.

Feb. 19, 1929.

COPYING LATHE Filed Nov. 50, 1927 5 Sheets-Sheet 1 Feb. 19, 1929. i1,702,796

' C. E. REED, JR.

COPYING LATHE Filed NOV. 30 1927 3 Sheets-Sheet 2- Feb. 19, 1929.1,702,796

c. E. REED, JR,

COPYING LAT-HE Filed Nov. so. 1927 s Sheets-Sheet 3 Patented Feb. 19,1929.

UNITED STATES PATENT OFFICE.

c AnLEs E. REED, .13., or AK BARK, ILLINOIS.

' oorYINe LATHE.

' Application filed November 30, 1927. Serial No. 236,666.

My invention relates, more particularly, to lathes provided for themanufacture of shoe lasts and more especiallygraded shoe lasts,

presents surfaces, as is common in some forms of shoe lasts, extendin ata relatively small, acute angleto each other, to provide means to ensurethe hugging of the follower by the pattern at all times thereby to avoidrebound which results in inaccurate reproduction of the pattern. p r IMy primary object/is to provide means for the purpose stated which shallbe of simple and economical construction and by the use of which lathesfor turning such ob'- jects may be operated at relatively great speed,thereby increasing'the output of the machine. I

WVhile my improvements are applicable to quite a ide range of types ofmachines, I

have chosen to illustrate them in a machine of the general typeshown' inthe pending application ofCharles E. Reed for U. S. patent on lathes,Ser. No. 650,194, filed July7, 1923,

wherein the swing frame referred to is pi;v

otally supported at its upper end and inethe operation of forming a lastswings to one side only of the vertical plane in which the pivot forthis frame is located.

Referring to the accompanying drawings: Figure 1 is a front View of acopying lathe g I as a shaft which is continuously operated by embodyingmy improvements. Figure 2 is a View in end elevation of one end of themachine. Figure 3 isa view in end elevation of the other end of themachine; and

Figure 1-, a broken view in longitudinal sectional elevation ofa-portion of the snubher mechanism for the swing frame.

Inasmuch asthe machine shown isof the same general construction as thatdisclosed in the Reed application above referred to, except for theomission ofcertain parts and the addition of certain mechanisms to causethe machine to embody my present invention,

detailed showing and description of the, ma-

chine appears to be unnecessary.

In texplanatlon of the machme shown, It

may be stated that the machine comprises a frame 5 equipped at one endwith cutting mechanism comprising a roughmv cutter 6 and finishingcutters one only of which isshown at 7 which arefrapidly rotated in the'operation of the machine. At the other end ofthe frame is the usualpattern follower 8- arranged in spaced relation to' the cutters in adirection lengthwise of the machine as" shown. frame 9 which ispivotally supported at opposite ends thereof, at its upper edge portion,to the upper end of the frame 5, as represented generally at 10. Thisframe has 'rotatably mounted thereon rotatable head stock devices 11 and12 which operate, through mechanismdriven from the motor represented at13, a pattern last 14: and the The machinc also comprises a swing work15, the patern 14 being supported by I the head stock 11 and astationary tail stock 16 and the work 15 by the head stock 12 and astationary tail stock 17. In the operation of turning alast therotatingpattern leand'rotating work 15 are forced against the pattern follower8, and the cutters, respectively, thejfollow-er and cutting mechanismbeing fed to the leftin Fig. 1 in a direction lengthwise of the work andpattern.

In the particular arrangement shown force exerted by gravity upon theswing frame 9, tending to 6 swing it to vertical position, is augmentedby a plurality of mechanisms represented generally at 18 and 19,

The mechanism 18 comprises a housing 20 mounted on a shaft 21 to floatthereon, this shaft which continuously rotates during the operation ofthe lathe and which may be operated, in any suitable way, being shownthe motor 13 and through which power is transmitted to the mechanism foroperating the carriages on which the cutters-and pat:

at a point substantially midway between the ends of the latter, by abracket 2? rigidly secured to a cross bar of the swing frame andpivotally connected, as represented at 2.8, to the forward end of therod 25.

Located in the space 23 of the housing 20 and surrounding and rigidlyconnected with, the shaft 21, is a friction. disk 29, the friction ringsurface of which flatwise opposes a ring surface 3f in the housing 20,this surface being yieldingly pressed at all times against the frictionring 30, by a coil spring 32 located in a recess 33 in the housing 20and bearing at its opposite ends against the end wall of this recess andan end of a split collar 34 having threaded engagement with the shaft 21to permit of its adjustment along the latter and relative to the housing20 to vary the spring tension, ball bearings 35 and 36 being preferablyinterposed between the ends of the spring 32 and the opposing portionsof the structure. Thus under the continued rotation of the shaft 21 incounterclockwise direction in Fig. 3, the engagement of the frie tiondisk 29 with the housing 20, as stated, operates to exert a continuingforce against the swing frame 9 tending to swing it to the left in Fig.3, namely, in a direction toward the follower and cutting mechanism.

It is preferred that the mechanism just described be associated withother mechanism exerting force against the swing frame 9 tending toswing it in the same direction the means shown for this purposecomprising coil springs 37 one at each end of the machine. Each spring37 is connected by an adjustable eye-bolt 38 with the lower end of theswing frame 9 and at its other end, by an eyebar 39 with the upper endof an arm 40, two of these arms being provided one at each end of themachine and rigidly connected with a rockshaft 41. The arms 40 arelinked to the swing frame 9, by links 12 pivotally connected at theirrear ends, as represented at L3 to the upper ends of the arms 40 abovethe points at which the springs 37 connect with these arms, the otherends of the links 42 being pivotally connected, as indicated at 44:, tothe swing frame at points above those at which the springs 37 areconnected with this frame. The arms f0 and links 42, connected togetherby means of the shaft 41, form means for equalizing the movement of theswing frame Sand preventing distortion thereof, and form toggles at theends of the swing frame which move toward extended position as the frame9 swings outwardly and thus operate against the tension of the springs37.

In the operation of the machine the pattern. and work are caused to bearwith the desired pressure against the follower and cutting mechanism, bythe action. of the mechanisms 18 and 19, the mechanism 18 also servingto prevent rebound of the swing frame and en-- sure the hugging of thepattern by the follower at all times even when the lathe is op eratingat relatively high speed.

While it is preferred that the mechanism 18 be used in connection withother mechanism, such as the mechanism 19, I do not wish to beunderstood as intending to limit my invention to its use with any othermechanism, as under certain conditions it may constitute the only meansprovided for swinging the frame 9 toward the follower and cuttingmechanism in which situation it would serve not only as apressure-producing device for the swing frame but also as a snubber toprevent rebound. Furthermore, while I have illustrated and described aparticular em bodiment of the combined pressure producing and snubbingmechanism for the swing frame, Ido not wish to be understood asintending to limit my invention thereto, as the same may be variouslymodified and altered without departing from the spirit of my invention.I

What I claim as new, and desire to secure eratively engaging said swingframe and op erative to swing the latter toward said follower andcutting mechanism.

2. A copying lathe comprising, in combination, cutting mechanism and apattern follower, a swing frame for the pattern and work, a

rotatable member, .means forrotating said member, friction disks, one ofwhich is driven by said rotatable member, a spring yieldingly forcingthe other of said disks into engagement with said first-referred-todisk, and.

means operativcly engaging said spring pressed disk with said swingframe, for the purpose set forth.

3. A copying lathe comprising, in combination, cutting mechanism and apattern'foL lower, a swing frame for the pattern and work, a rotatableshaft, means for rotating said shaft, a housing member mounted on saidshaft and relative to which the latter is rotatable, a friction disksecured to said shaft to rotate therewith in said housing, a springyieldingly forcing said housing into frictional engagement with saiddisk, and means connected with said housing and operatively engagingsaid swing frame, for the purpose set fortl.

4. A copying lathe comprising, in combination, cutting mechanism and. apattern follower, a swing frame for the pattern and work, a rotatablemember, means for rotating said member, a spring-pressed device frictionally driven by said member and operativelyengaging said swing frameand operatlve to swing the latter toward said follower and work, arotatable member, means for rotating said member a spring-pressed devlcefrictionally driven by said member and Opera 10 tively engaging saidswing frame and operative to swing the latter toward said follower andcutting ,mechanism, and other spring means exerting force on said swingframe tending to swing it toward said follower and cutting mechanism.

CHARLES E. REED, JiR.

